Adding machine



April 2 1, 1925. 1,534,811 `l -1. ROTHMAN ADDING MACHINE Filed March 9, 1925 2 Sheets-Sheet 1 aumento:

April 21, 1925.v 1,534,811

' L. ROTHMAN ADDING MACHINE Filed-March 9, 1925 2 sheetsl-Sheet 2.

elHozncIJ on the line 5-5 of Fig. 4.-

"sa .l n

Tl'iese gears'vlare adapted' to receive vPatented. Apr. 21, 192,5.

UNITED s 'mrlas'i PATENT' OFFICE. f-

' Lotus B ornnng or Baooxmm, NEW Yonxj" mime Maquina Y and useful Improvements in Adding Mauser,the' invention havin taken on the line 6-6 f ig. 5.

chines, of which the following is a specification.

This invention relates to adding machines, being designed more particularly for embodim'ent-v in small machines which ma be readily carried around in the pocket o the to provide an im roved an simplified addini` machine of t 4is type.

or further comprehension of the inven-' tion, and of the objects and advantages thereof, reference will'be had to the following description and accom anylng drawings, andto theappended alms `1n whlch f the various novel features of the invention are more particularly set forth. l

Fig. 1 of the drawings is a face view, of

my improved adding machine.

Fig. 2 is a side view thereof.

` 3 3 of Fig. 1.

Fig. 4 is a transyerse .vertical sectional view on the line 1 -4 of Fig.. 1.

Fig. 5 is a horizontal sectlonal vlew taken Fig. 6 is a fragment vertical section Fig. is an elevation of'one of :the number wheels.

Asl here embodied my improved addingmachine comprises a flat-.rectangular casing 10 closed onl all sides. Extending across this casing near one end thereof is a normally fixed shaft 11- which is mounted at its lends in the side walls of the casing. Upon this shaft are freely mounted a number of number carrying wheels 12 which are adaptprocess, fu'r` ed :forgrotation in the adding ther reference being. made in detail to these wheels later. Thev peripheries of these Wheels are arranged to present, axially projected relation to one another, a pair of ratchet wheel' elements 13 and .14 between vwhich are short cylindrical parts, freely surrounded by Img-.gears 15 carryingspring pressed pawls 16.1' en a whole.

for an obj ect' through the medium of g direction. ratchet e1ements14 whereby rotationis im` Aparted fromthe gears 1 5 to the wheels as Appiicaaop mea laren a, 192s. serial zo. wrs.

rotary movement from 'rack-oars 18 slidable i on the 'bottom 'wallf of the casing. These rack-bars are operated by means `of p'inions 19 on a second shaft 20 parallel to the shaft. .1 1 in the casing 10 and journaled in' the side walls ofthe casing. On one end ofthis shaft is fixed a gear 22 which is adapted to be eng bya rack-bar 23 slidable on the top wal of the casin and having a projecti handle 24 whlch extends thro h a longitudinal slot`25 in the top wall oflth casing. The inions 19 are `loose upon .the shaft 20 and ave a yieldi" operative or sllp clutch,` engagement wlth the shaft fixed to collars 28 on the s aft and having obtuse angled transverse members 29 on their ends engaging in shallow V-notches 30 1n the periphery of a disk element 31 formed integral with t e gears 19. l

g fingers 27l of pins 35 extending through the top wall of the casing and suitably guided in aperf Fig. 3 is a horizontal sectiononthe line tures therein, these pins having heads 35 I on their outer ends on which are printed the numbers.v

These pins are arran d in longitudinal rows, ten to a row `an there .A are as many rows as it may be desired, each .A

row representing a column of Upon the rear ends of the -bars 18 are offsets or lugs 18 which are adapted to engage the inner ends of the ins 35 when the latter are pushed inward3 bein normally held clear of the paths. of the ugs 18 by means of expansion sprin 37 coiled therearound. Upon the inner en s of the pins are pivoted as at 38 hooked 90. these pinelatches 39 having v`beveled ends, and which j To release the latches 3 9 the plate 41 is vmade'slidable insuitable guides and has a pin 42 fixed -to' its rear end and projecting through the end wall of the casing, de-

position when swung in the other pression Ameans of an expansion spring when any pin o'f-.this pin causing the plate-to. move and free the latches from engagement therewith. 'In describing the relation of the parts the top wall or face of the casing Ais the one through which the keys extend,

the corresponding rack-bar will be moved forward to engaging position with respect to its pinion and ring-gear. As shown in the drawing the ring-gear and pinion which are engaged by a' common rack-bar are slightly olf-set from one another in `the direction of their axes and the rack-bar is of suflicient width to engage both, while it has at its forward end a narrower portion 18a which engages only the ring-gear, passing freely by the pinion, so that when thev rack-bar is moved forward it simultaneously engages the pinion and ring-gear.

To eect this forward movement of the rackbar when anyone of the corresponding row of pins is pushed in I form on the keypins 35 the cam projections 47 adapted to ,engage complementary projections 48 on a series of slides 49 slidable in the casing above the plate 41 and which have slots 50 therein thropgh which the pins pass freely. The rear ends of these slides abut against the upper ends of levers 51 fulcrumed betweenV their ends as at 52 in the casing and whose lower ends bear against the rear end of the rack-bars 18. The slides 49 are held in normal position by means of coiled expansion springs 53 which bear against the rear ends thereof.

Referring now in detail to the wheels 12, these are formed,fin addition tothe ratchet elements 13 and 14,- with printing type 56 to print the numbers from zer tonine while adjacent vthe type are smooth surfaces on which may be marked like numbers which are visible one at a'time through apertures 57 in tlie face of the casing. Mounted Ain the casing are the spring-pressedcentering pawls 58 which engage in suitable notches 59 in the peripheries of integral projections 60 on the wheels. Each wheel may, in addition be frictionally held against rotation 'on the shaft 11 by means ofa spring element 61 fixed to the shaftand bearing against one end of said wheel. The transfer mechanism from one wheel to the next consists of an -.against means are provided so that of a given row is depressed arm V62 pivoted on the wheel andadapted to be moved into engagement with the ratchet element 13 on the adjacent wheel by a cam 63xed to the bottom wall of the casing.

The type 56 are adapted to print on a `paper strip 65 which is mounted in .the' ca sof a roll on a mandrel 66 In ing in the form the latter and which passes up between a pair" of rollers 67 and out through an opening68. The paper is adapted to be movedv the'type by means of a platen bar' 70 fixed on one end of aseries of slide-bars 73. VThisuock-shaft has fixed thereto an arm 74 (Fig. 2) to which is connected one end of a link 7 5 which extends rearwardly along the bottom wall of the casing and has an offset 7 5' on its rear end'adapted to be engaged by a pin 23 ,(Fig. 3) on the rack-bar 23 to rock the shaft 7 3.

- Fixed to the rollers 67 are gears 78 whereby the rollers are Icaused to rotate to feed the paper, these gears being operated by a train 79, the initial one of which receives movement from rack-teeth formed on one of the,slidebars 71. The platen bar 70 is moved away from the type by means of ex- -71"slidable in the casing and whose other pansion springs 81 coiled around the slidebars 71. In connection with one of the gears 79 is a ratchet and pawl device 7 9 to provide for one-way movement only.

The sheet containing the figures which are being added may be passed arounda roll 85 carried ina housing 86 projecting from the face of the casing, being held in contact with such roll by hinged fingers 87 while a pointer 88 may be provided to indicate the row of. Y

numbers, a bar 89.

.In the operation of my improved adding this pointer being adjustable along machine, assuming that numbers of several integers are being added, the correspondin keys 35 in the proper rows are first depresse 3 by a stylus suitably,attached on' the index finger. Upon 'depression of these keys the .slides 49 will be shifted and will cause the proper rack-bars 18 to move. forward to engage the pinions 19 and gears 1 5. The handle 24 is then pulled, rotating shaft 20 and causing the engaged rack-bars to move forward and advance the corresponding ones of the `wheels 12. each rack-bar moves .forward'its lug -18 abuts against the latch of the depressed keyv and further movement of the rack-bar is prevented, the spring iingers 27 riding over the element 31 as rota- -tion of the shaft 20 is continued, the movement of the rack-bars being limited at the project through openings 1 24 the gea-rs 1 5 rotate backfreely Having thus described my invention, what I claim as new and-desire to protect by Letters Patent of the United States is as follows:

to have its movement limited by selective in dividual engagement with the inner ends of the keys when the said keys are depressed, said movable member being normally out of engagement with the said wheel, and means whereby said movable member is moved into engagement with the said wheel bydepre'ssion of any one of said keys.

2. In an adding machine, a casing, a row of keys, a number-carrying wheel, and an op- Erising ooke erating device for said wheel, said operating device comprising a movable member associated with the row of keys and adapted to have its movement limited by selective individual engagement with the inner ends of the keys when the ysaid keys are depressed, said movable member being normally out of engagement with the said wheel, and means whereby said movable member is moved into engagement with the said wheel by depression of any one of said keys, said means coma plate slidable in the casing, and latches pivoted on the inner ends of the said keys and adapted to be engaged by said plate.

In testimony whereof I have ailixed my signature.

LOUIS RoTHMAN. 

